MHT CET · Physics · Wave Optics

Assuming human pupil to have radius of 0.25 cm and comfortable viewing distance of 25 cm , the minimum separation between the two objects that human eye can resolve at 500 nm wavelength is nearly

A \(300 \mu \mathrm{~m}\)
B \(30 \mu \mathrm{~m}\)
C \(1 \mu \mathrm{~m}\)
D \(100 \mu \mathrm{~m}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(30 \mu \mathrm{~m}\)

Step-by-step Solution

Detailed explanation

\(d = 2r = 2 \times 0.25 \times 10^{-2} \text{ m} = 0.5 \times 10^{-2} \text{ m}\) \(\Delta \theta = \frac{1.22 \lambda}{d} = \frac{1.22 \times 500 \times 10^{-9} \text{ m}}{0.5 \times 10^{-2} \text{ m}} = 1.22 \times 10^{-4} \text{ rad}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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